[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.048007] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.569497] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.836589] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.502213] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) [ 23.672707] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 29.263004] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 29.351366] BUG: unable to handle kernel paging request at ffffeafffd368008 [ 29.358720] IP: [] page_remove_rmap+0x2e/0x260 [ 29.364968] PGD 0 [ 29.367206] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.372165] Dumping ftrace buffer: [ 29.375692] (ftrace buffer empty) [ 29.379373] Modules linked in: [ 29.382656] CPU: 0 PID: 3835 Comm: syz-executor861 Not tainted 4.4.150-g5541782 #83 [ 29.390443] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.399774] task: ffff8800acdd4800 task.stack: ffff8800bbbb0000 [ 29.405803] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.414481] RSP: 0018:ffff8800bbbb79c0 EFLAGS: 00010246 [ 29.419903] RAX: dffffc0000000000 RBX: ffffeafffd368000 RCX: 0000000000000000 [ 29.427149] RDX: 1ffffd5fffa6d001 RSI: ffffffff814bceaf RDI: ffffeafffd368008 [ 29.434395] RBP: ffff8800bbbb79d0 R08: ffffffff85333170 R09: 0000000000000000 [ 29.441639] R10: 0000000000000001 R11: ffff8800acdd4800 R12: 0000000000000001 [ 29.448883] R13: 1ffff10017776f3e R14: ffff8800b47d8800 R15: ffffeafffd368000 [ 29.456127] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.464329] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.470184] CR2: ffffeafffd368008 CR3: 00000000b38a5000 CR4: 00000000001606f0 [ 29.477427] Stack: [ 29.479550] ffff8800bbbb7c50 0000000000000001 ffff8800bbbb7a78 ffffffff8150ad13 [ 29.487545] 00003fff4da001e0 00003fff4da001e0 0000000041b58ab3 ffffffff841ef837 [ 29.495582] ffffffff8150ab10 00000000000004f0 ffff8800b16a7e18 ffff8800bbbb7a40 [ 29.503570] Call Trace: [ 29.506133] [] zap_huge_pmd+0x203/0x510 [ 29.511732] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.518287] [] unmap_single_vma+0xea3/0x1240 [ 29.524321] [] ? vm_normal_page+0x280/0x280 [ 29.530268] [] ? __put_single_page+0x60/0x60 [ 29.536300] [] unmap_vmas+0x81/0xd0 [ 29.541553] [] exit_mmap+0x1c9/0x3a0 [ 29.546906] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.553460] [] ? up_write+0x1a/0x60 [ 29.558710] [] mmput+0xf8/0x2d0 [ 29.563612] [] do_exit+0x8d8/0x26b0 [ 29.568881] [] ? file_map_prot_check+0x193/0x310 [ 29.575271] [] ? release_task.part.17+0x1200/0x1200 [ 29.581932] [] ? SyS_mprotect+0x41e/0x640 [ 29.587707] [] ? up_write+0x1a/0x60 [ 29.592959] [] ? SyS_mprotect+0x423/0x640 [ 29.598732] [] do_group_exit+0x111/0x330 [ 29.604420] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.610887] [] SyS_exit_group+0x1d/0x20 [ 29.616486] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.623034] Code: e5 41 54 53 48 89 fb e8 31 76 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 03 76 e9 ff f0 83 43 18 ff 78 [ 29.649924] RIP [] page_remove_rmap+0x2e/0x260 [ 29.656270] RSP [ 29.659867] CR2: ffffeafffd368008 [ 29.663292] ---[ end trace b60334c2fe482f31 ]--- [ 29.668019] Kernel panic - not syncing: Fatal exception [ 29.673665] Dumping ftrace buffer: [ 29.677182] (ftrace buffer empty) [ 29.680866] Kernel Offset: disabled [ 29.684485] Rebooting in 86400 seconds..